| bottomless pit(noun, expression, misery, grave, inferno) | |
| brown study | |
| bubble(noun, desire, fancy, idea, impression) | |
| bug bear(expression, idiom, fear) | |
| cacodemon | |
| calamity(trouble, torment, trial, suffering) | |
| calvary(noun, trouble, bother, blow, distress) | |
| care(noun, trouble, bother, blow, distress) | |
| castle in the air(noun, expression, idiom, desire, fancy) | |
| clawing | |
| clog | |
| colic | |
| conceiving(noun, desire, fancy, hope, image) | |
| conception(noun, concept, understanding, desire, view) | |
| concern(noun, distress, anxiety, horror, dread) | |
| conflict(noun, torment) | |
| convulsion | |
| cramp | |
| creativity(noun, desire, fancy, hope, image) | |
| crick |
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| APA | Smart Define. (2016). nightmare thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/nightmare/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "nightmare thesaurus" https://smartdefine.org/nightmare/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, nightmare thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/nightmare/thesaurus/synonyms>. |
| MLA | Smart Define. "nightmare thesaurus" 29 February 2016. Web. 23 September 2026. <https://smartdefine.org/nightmare/thesaurus/synonyms> |